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Old September 8th, 2011, 06:07 AM   #1
crassell
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Default 7.3 runs like crap

1995 7.3, E40d, 5.13 gears. All stock. Iíve had the truck for couple years, but just this week got it on the road.
Truck runs like crap, starts hard, has no power. Canít figure out why.
Both fuel tanks are new, all new fuel lines. Fuel filter. Cam sensor. Glow plugs. New back pressure sensor. Acts like the turbo is not working. Very sluggish to accelerate.
I'm comparing this to other diesels Iíve had in the past; 88 f350, 90 F250, 1996 K2500. All of these would outperform the 95.
Suggestions? Ideas?
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Old September 8th, 2011, 06:35 AM   #2
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Sounds like the back pressure valve is stuck closed.
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Old September 8th, 2011, 06:43 AM   #3
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X2, I hate that damn valve. Some day I'll delete it.
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Old September 25th, 2011, 02:38 PM   #4
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Have you checked the air filter?
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Old October 16th, 2011, 07:37 PM   #5
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i know this is an old post but did you ever figure it out? guy i work with has a 94 F350 diesel with very similar issues. i haven't looked at it yet but i'm curious as to a direction i should look first.
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Old October 16th, 2011, 09:07 PM   #6
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does it blow white smoke? clogged cat/particle filter? check fuel pressure? Bad injectors? does it idle ok?
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Old October 18th, 2011, 04:55 PM   #7
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It was the EBPV or sensor, I forget.
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Old November 29th, 2011, 11:15 AM   #8
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The place working on mine had a simular problem with a Dodge.....It had a mouse nest in the intake all the way to the Turbo.............
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Old December 21st, 2011, 09:55 PM   #9
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Might sound crazy but check the engine oil level. The 7.3 PSDs had oil fired injectors. For those of you who don't know the injectors on a PSD are fed oil by a high pressure oil pump. When the oil pressure reaches the needed psi it will "pop" the injectors feeding the engine fuel. It's possible the oil level is low enough that the high pressure oil pump can't provide enough pressure to properly fire the injectors. I know this because it happened to a buddy of mine, the engine oil level got low enough to the point to where the truck wouldn't even run. As soon as he topped it off it ran like a champ. I could be wrong but it's something simple and easy to check. Hard starting probably is due to bad glowplugs.
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Old January 7th, 2012, 04:38 PM   #10
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hard start could be a glow plug problem(relay, glow plugs themselves, under valve cover harness as well)
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